R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
kobject_add_internal failed for gsmtty129 (error: -12 parent: tty)
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 19489 Comm: syz-executor.1 Not tainted 5.5.0-rc5-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
RIP: 0010:cdev_del+0x28/0xa0 fs/char_dev.c:593
Code: 00 00 55 48 89 e5 41 54 49 89 fc 48 83 ec 08 e8 7e ba b6 ff 49 8d 7c 24 64 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 55 49
RSP: 0018:ffffc900087efa18 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff888078cc9f00 RCX: ffffc90004589000
RDX: 000000000000000c RSI: ffffffff81be3b12 RDI: 0000000000000064
RBP: ffffc900087efa28 R08: ffff88805eac4440 R09: fffffbfff165e7b2
R10: fffffbfff165e7b1 R11: ffffffff8b2f3d8f R12: 0000000000000000
R13: 0000000000000408 R14: ffff888078c35408 R15: ffff88801f62c028
FS:  0000000000000000(0000) GS:ffff88802d100000(0063) knlGS:00000000f5d25b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007f5b13abd028 CR3: 000000005e010000 CR4: 0000000000340ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tty_unregister_device drivers/tty/tty_io.c:3195 [inline]
 tty_unregister_device+0x117/0x1b0 drivers/tty/tty_io.c:3190
 gsmld_detach_gsm drivers/tty/n_gsm.c:2398 [inline]
 gsmld_close+0xbb/0x210 drivers/tty/n_gsm.c:2467
 tty_ldisc_close.isra.0+0x119/0x1a0 drivers/tty/tty_ldisc.c:489
 tty_ldisc_kill+0x9c/0x160 drivers/tty/tty_ldisc.c:637
 tty_ldisc_release+0xe9/0x2b0 drivers/tty/tty_ldisc.c:809
 tty_release_struct+0x1b/0x50 drivers/tty/tty_io.c:1616
 tty_release+0xbcb/0xe90 drivers/tty/tty_io.c:1789
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 get_signal+0x206e/0x24f0 kernel/signal.c:2528
 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_32_irqs_on arch/x86/entry/common.c:352 [inline]
 do_fast_syscall_32+0xbbd/0xe16 arch/x86/entry/common.c:408
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f29a39
Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f5d250cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000005423
RDX: 00000000200000c0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 9c9034b3a09bfdf4 ]---
RIP: 0010:cdev_del+0x28/0xa0 fs/char_dev.c:593
Code: 00 00 55 48 89 e5 41 54 49 89 fc 48 83 ec 08 e8 7e ba b6 ff 49 8d 7c 24 64 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 55 49
RSP: 0018:ffffc900087efa18 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff888078cc9f00 RCX: ffffc90004589000
RDX: 000000000000000c RSI: ffffffff81be3b12 RDI: 0000000000000064
RBP: ffffc900087efa28 R08: ffff88805eac4440 R09: fffffbfff165e7b2
R10: fffffbfff165e7b1 R11: ffffffff8b2f3d8f R12: 0000000000000000
R13: 0000000000000408 R14: ffff888078c35408 R15: ffff88801f62c028
FS:  0000000000000000(0000) GS:ffff88802d100000(0063) knlGS:00000000f5d25b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007f5b13abd028 CR3: 000000005e010000 CR4: 0000000000340ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400